I don't even remember bruce having a love interesting in the second hulk movie - That's how little it impacted me.

But in captain america it had the most impact of anything else in the movie.

Different things reasonate with people differently based on their character and where they are in life.
So anyone saying the love story had no chemistry or effectiveness in captain america, as though it were an objective analysis, is merely giving their own personal opinion based on how they received it.

Ditto! Of the super hero loves stories I've seen this one I enjoyed the most. Unrequited love can be the best. Unrequited love has long been depicted as noble, an unselfish and stoic willingness to accept suffering. Thats cap :-)